如何平均一個變量的最後十個實例，並顯示

Question

喜女士和先生們，

，請原諒我，如果我輸入下面的代碼錯了，因爲這是我第一次在這裏發佈。我在這裏有一個python腳本，每隔十分之一秒輪詢一個電容器，目前正在使用一個光敏電阻來確定外部亮度。

唯一的問題是數值通常會偏差+/- 5左右。我想實現一行代碼，它每秒鐘平均最後10次民意調查並打印出來。我不知道從哪裏開始，任何幫助將不勝感激！

#!/usr/local/bin/python 
import RPi.GPIO as GPIO 
import time 
import I2C_LCD_driver 
GPIO.setmode(GPIO.BOARD) 
mylcd = I2C_LCD_driver.lcd() 
#define the pin that goes to the circuit 
pin_to_circuit = 40 
def rc_time (pin_to_circuit): 
    count = 0 

    #Output on the pin for 
    GPIO.setup(pin_to_circuit, GPIO.OUT) 
    GPIO.output(pin_to_circuit, GPIO.LOW) 
    time.sleep(0.1) 

    #Change the pin back to input 
    GPIO.setup(pin_to_circuit, GPIO.IN) 

    #Count until the pin goes high 
    while (GPIO.input(pin_to_circuit) == GPIO.LOW): 
     count += 1 

    return count 

#Catch when script is interrupted, cleanup correctly 
try: 
    # Main loop 
    while True: 
     print "Current date & time " + time.strftime("%c") 
     print rc_time(pin_to_circuit) 
     a = rc_time(pin_to_circuit) 
     mylcd.lcd_display_string("->%s" %a) 
     mylcd.lcd_display_string("%s" %time.strftime("%m/%d/%Y %H:%M"), 2) 
     except KeyboardInterrupt: 
    pass 
finally: 
    GPIO.cleanup() 

Answer 1

你可以在你的主循環定義的列表：

polls = [] 
#Catch when script is interrupted, cleanup correctly 
try: 
    # Main loop 
    while True: 
     print "Current date & time " + time.strftime("%c") 
     print rc_time(pin_to_circuit) 
     a = rc_time(pin_to_circuit) 
     #add current poll to list of polls 
     polls.append(a) 
     #remove excess history 
     if len(polls) > 10: 
      polls.pop(0) 
     #calculate average 
     avg = sum(polls)/len(polls) 
     mylcd.lcd_display_string("->%s" %avg) 
     mylcd.lcd_display_string("%s" %time.strftime("%m/%d/%Y %H:%M"), 2) 
except KeyboardInterrupt: 
    pass 
finally: 
    GPIO.cleanup()